Adjusting mechanism for pressure gauges



J. w. MoTHERwx-:LL

ADJUSTING MECHANISM FOR PRESSURE GAUGES vMatch 20, 1928. 1,663,313

'Original Fild May 23. 1 924 Patented Mar. 20, 1928.

UNITED STATES i if 1i-:N'r oFFicfE,

Josnrnw. MOTHERWELL, or MELROSE, MASSACHUSETTS, Assisivon" To THE ASHTONVALVE COMPANY, A CORPORATION OFy MASSACHUSETTS.

ADJUSTINGMECHANISM Eon PRESSURE GAUGES.

Continuation, of application Serial No. 715,399, filed May 23,` 1924.This application ,filed December 27,

' 1924.' Serial No. 758,414.

The principal object of my invention is to provide an adjustingmechanism. for gauges Which is easy to operate and which is elficientand which, inthe preferred form, is accessible from the exterior of thegauge casing.

A feature of my inventionn is a single member, movement of whichaccomplishes f adjustment of the gauge.

Another feature is a member, the mere rotation of Which accomplishessuch adjustment.

Another feature consists in locating the adjusting member so as to beaccessible from the exterior of thegauge casing. i

@ther features will be pointed out below.

In the drawings:

Figure l is a front elevation of a gauge, showing the parts Which embodymy invention; Figure 2 is a side elevation thereof, some of the parts ofFigure l being omitted; and

Figure 3 is an enlarged detail, illustrating a modification of theadjusting mechanism.

The gauge casing A has the usual inlet A leading to Bourdon spring tubesA2, A3, A4' and A5, the movable ends of which are rigidly connected byhead As Which has a,

lug e', pivoted to member e@ The inlet pipe A has an extension B thepinion the latter being rigidly connected to the ordinary indicator',which it is not considered necessary to illustrate. Segment o pivoted toelement Bat b2 meshes with pinion o at one end and has its other endpivotally connected to adjustable link B', the latter having pivotalconnection with bell crank lever D, pivoted at d to member B said bellcrank lever having suitable fixed connection with slotted member D. Tivoperforated leaf springs E and E are rigidly connected at one end tomember D and at the other end to member e.

Screw E has a head Which engages the outside of leaf spring E and has ashank passing through the perforations of both of said leaf springs, nutE6 being movable to force the springs together and thereby in-` creasethe distanceV between members e and D. Spring E7 is coiled around theshank of screw E5 and tends to force the leaf springs apart so that ifthe nut is unscrewed which supports` plished may be very fine and isaccomplished by mere rotation of a single member Without anydetachmentand attachment of elements.

In Figure v.3 I show another form of mechanism for adjusting by mererotation, and in this figure head G may be suitably connected to anydesired Bourdon tube or tubes and has lug g pivotally connected to blockg provided with shank g2 sliding in socket g3 in block g* which isslotted for adjustable engagement with member H to be suitably connectedwith a segment. Blocks g5 and g are interiorly threaded to engage theright and left threading on the shank of screw G and are pivotallyconnected to blocks g and g4 by links it, L, k2 and ha so that whenscrew G is turned in one direction blocks g5 and g Will move toward eachother and therefore move blocks g and g4 farther apart While if thescrew is turned in the opposite direction the blocks g5 and ge willvmove away from each other and therefore move blocks g and g4 nearertogether.

In order that the adjusting member may be available from lthe exteriorof the casing I provide in the casing an opening A7, through which, intheform shown, extends nut E6.

Among the advantages of my device I may point out that adjustment is hadby the movement of a single member and this movement may be very slightand consequently accomplish very-fine adjustment and another advantageis that, if desired, this adjustment may be made from the outside of thecasing.

What I claim is:

l. A device of the character described comprising an indicator; aBourdon tube; means to operatively connect said indicator andsaid tubeincludingtvvo leaf springs; and a member rotatable to adjust saidsprings.

E2. A device of the character described comprisingan indicator; aBourdon' tube; means to operatively connect said indicator and said tubeincluding two leaf springs; i another spring normally tending to forcesaid leaf springs apart; and a screw and nut cooperating toforce theleaf springs toward los sa', 'i

each other to give relative adjustment between said indicator and saidtube.

3. A device of the character described comprising an indicator; aBourdon tube; nieans to operatively connect said indicator and said tubeincluding two leaf springs; and a. member rotatable to adjust saidsprings; and means to prevent undesired rotation of said member. p

li. A device of the character described comprising an indicator; aBourdon tube; means to operatively` connect said indicator and said tubeincluding two perforated leaf springs; a 'screw having a head exteriorlyengaging one of said leaf springs and hav inga shank passing throughsaid perforations,v said shank having a. threaded portion;

.a nut engaging the outside of the other leaf spring and threaded toengage the threading of said shank to force the leat` springs towardeach other to give relative adjustment between said indicator and saidtube; and a coiled spring between said leaf springs and coiled aroundsaid shank, one end of said coiled spring abutting against the inside ofone of the leaf springs and the other end abutting against the inside ofthe other leaf spring, said coiled spring tending to torce one leafspring against said' head and the other against said nut and thereb7prevent undesired turning of said nut with relation to said screw.

JOSEPH W. MOTHERWELL.

